Android中如何无损保存BitMap文件？

Question

//拍摄完照片后执行的方法
protected void onActivityResult(int requestCode, int resultCode, Intent data){
    if (requestCode == TAKE_PICTURE) {
        if (resultCode == RESULT_OK) {
            Bitmap bm = (Bitmap) data.getExtras().get("data");

            TakePictureActivity.bm=bm;

            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
            File myCaptureFile = new File("sdcard/Allimage_Theelderly/"+df.format(new Date())+".jpg");

            try {
                BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));

                bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);

                bos.flush();

                bos.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    Intent takepic = new Intent(this,TakePictureActivity.class);
    startActivity(takepic);
}

Answer 1

压缩参数设置为100，但是保存后的图片分辨率很低，图片很花，请问怎样才能无损保存？